Perfil sísmico vertical
Sometimes the surface sources are moved about the area as well as the geophone depth being changed. Where the source point is an appreciable horizontal distance from the well head, the result is an offset VSP; this provides a way to look to the side of the borehole.
For an azimuthal VSP sources are offset in different directions. In a walkaway VSP a surface source moves while the geophone in the borehole remains stationary; this provides another way to look to the side of the borehole. In a reversed VSP the source is in the borehole and geophones are on the surface.
- Sheriff, R. E; Geldart, L. P (August 1995). Exploration Seismology, 2nd Ed. Cambridge Univ. Press. p. 490. ISBN 9780521468268. Cite error: Invalid
<ref>tag; name "Sheriff" defined multiple times with different content
- Gilpatrick, Rory; Fouquet, Doyle (1989). "A user’s guide to conventional VSP acquisition". The Leading Edge 8 (3): 34–39. doi:10.1190/1.1439615. ISSN 1070-485X.
- Hinds, Ronald C.; Anderson, Neil L.; Kuzmiski, Richard D. (1996). VSP Interpretive Processing. Society of Exploration Geophysicists. doi:10.1190/1.9781560801894.
- Whaley, J., 2017, Oil in the Heart of South America, https://www.geoexpro.com/articles/2017/10/oil-in-the-heart-of-south-america], accessed November 15, 2021.
- Wiens, F., 1995, Phanerozoic Tectonics and Sedimentation of The Chaco Basin, Paraguay. Its Hydrocarbon Potential: Geoconsultores, 2-27, accessed November 15, 2021; https://www.researchgate.net/publication/281348744_Phanerozoic_tectonics_and_sedimentation_in_the_Chaco_Basin_of_Paraguay_with_comments_on_hydrocarbon_potential
- Alfredo, Carlos, and Clebsch Kuhn. “The Geological Evolution of the Paraguayan Chaco.” TTU DSpace Home. Texas Tech University, August 1, 1991. https://ttu-ir.tdl.org/handle/2346/9214?show=full.